The straight river course north of Edebäck has been classified by Sten De Geer as a "tectonic valley" as it follows the Protogine Zone—a bedrock weakness zone of Precambrian age.

[6] The river course north of Edebäck formed an ancient fjord after it became free of glacier ice and before the post-glacial rebound definitely raised the valley bottom above the sea.

In the first half of the 20th century the geography and Quaternary geology Klarälven was studied by various Swedish researchers including Alfred Elis Törnebohm, Sten De Geer and Lennart von Post.

[4] Åke Sundborg's 1956 outstanding PhD thesis and publication on the geomorphology and hydrology of Klarälven is considered a major reference work for river studies in Sweden.

When the log driving stopped in 1991, it was later reported that the beneficial effects were slowly disappearing as shore vegetation grew denser, providing a less favourable environment for the fish.

[citation needed] Modern day tourist attractions in addition to sport fishing include canoeing, as well as rafting from Branäs to Edebäck.

They were then held up by a floating structure resembling a fence until loggers could move out on the logs, identify them and guide them to their designated areas using special hooks.

[13] As many as 1,500 people were working seasonally, employed by the local log drivers' society, paid by the paper mills and forest owners.